libio-multiplex-perl 1.16-1 (armhf binary) in ubuntu bionic

 IO::Multiplex is designed to take the effort out of managing
 multiple file handles. It is essentially a really fancy front end to
 the select() system call. In addition to maintaining the select()
 loop, it buffers all input and output to/from the file handles. It
 can also accept incoming connections on one or more listen sockets.